Support for centerings.



Nn. 628,|9|. Patented July 4,1899.

T.- u. VINTON. SUPPORT FOR GENTERINGS.

(Application filed. Apr. 11, 1898.)

(No llbdel.)

' 3 IG- 2 MTN SSBS: m/epl'rmai m: NQRHIE Farms 00 PuoTaumd, WASHINGTON, n c.

UNITED STATES PATENT OFFICE- THOMAS M. VINTON, OF BOSTON, MASSACHUSETTS.

SUPPORT FoR QENTERINGS.

SPECIFICATION forming part Of Letters Patent N0. 628,191, dated July 4, 1899.

Application filed April 11, 1898. Serial No. 677,166. (No modelh tion.

This invention has relation to means for supporting the temporary centerings upon which arches of fireproofmaterial, such as masonry or concrete, are to be built between the girders or joists of a floor.

The object of theinvention is to provide a detachable support which shall be light and durable and which can be secured in place or removed with facility and without the consumption of a great deal of time and labor. It is usually more or less difficult to detach that portion of the support which rests upon the girder and is surrounded and covered with masonry and concrete, and hence another object of the invention is to provide a hanger which can be readily knocked off from the girder with but little exertion after the arches have been completed.

To attain the various objects of my invention, I embody it in the form illustrated upon the drawings and now to be described in detail, and pointed out in the claim hereto appended.

Reference is to be had to the accompanying drawings, and to the letters marked thereon, forming a part of this specification, the same letters designating the same parts or features, as the case may be, wherever they occur.

Of the drawings, Figure 1 shows in perspective my improved support secured in place ready to receive the centerings. Fig. 2 represents a section through an arch and the girders supporting it with my invention illustrated in elevation. Fig. 3 represents a section on the line 3 3 of Fig. 2. Fig. 4 represents a hanger provided with a set-screw. Fig. 5 represents the wedge.

Referringto the drawings, the I-beams or girders between which the arch is to be built are indicated at a a, and it is upon their lower inwardly-projectin g flanges that m y im proved support is hun b 5 indicate two hangers, duplicates of each other,which are suspended from the said girders. Each hanger is of cast or wrought iron,

cross-bar c, the ends of which project beyond the hangers. shaped in cross-section, is placed in the elongated slot 19 to rigidly bind the bar to the hanger and is either above or below the crossbar, the position of the said block depending on whether the cross-bar is to be raised or lowered. If desired, a set-screw b may be employed to bind the hanger, the cross-bar, and the block all firmly and rigidlytogether, and in such event the hanger is made alittle thicker, and the set-screw is screwed into the lower end thereof.

The cross-bars are preferably lengths of gaspipe of the desired diameter, since they are sufficiently strong for general purposes and are easily obtained. These cross-bars besides being light, strong, and readily obtained possess the advantages over rectangular bars of permitting the boards to be slid over them with a minimum amount of friction when it is desired to place or remove said boards or move them longitudinally for any purpose over said bars. Owing to the fact that the wedges are crescent-shaped in cross-section 'they fit the bars and the rounded ends of the elongated apertures in the hangers with a greater amount of friction to prevent displacement than is possible with wedges that are rectangularin cross-section. Hence said Wedges do not require to be driven in with great force and can therefore be more easily loosened than flat wedges.

When the hangers are in place, so that their fingers take over the flanges of the girders and the wedges bind them and their crossbar together, they form one rigid support on which the centerings e may be laid to support the concrete or fireproof material f of which the floor is constituted.

After the floor is built the centering may be removed by forcing the wedges out. Inorder to catch the boards forming it, bars, as shown in dotted lines in Fig. 2, are passed loosely through the lower apertures 12 b of the hangers, whereby the boards may be subsequently removed one by one.

Having thus explained the nature of the in- A wedge or block (I, crescent-' veution and described a way of constructing of the first said cross-bars for the purpose de- I0 and using the same, though without attemptscribed. ing to set forth all of the forms in which it In testimony whereof I have afiixed my sigmay be made or all of the modes of its use, I nature in presence of two Witnesses. declare that what I claim is T I T A support for centering comprising cross- THOMAS INTOL bars, and hangers engaging the girders, said \Vitnesses: hangers having apertures to receive addi- A. D. HARRISON, tioual cross-bars in'a plane below the plane O. F. BROWN. 

